There is a Louis Roche who appears on electoral registers at 24 Napier Avenue, Fulham during the 1920s and 1930s. Variously Louis Frederick Paul Roche or Louis Paul Frederick Roche, several different spellings. Is he the one? He appears to have a wife Elizabeth and daughter Marie Emilie living with him (electoral registers don't state relationships, this is just an assumption). The family have moved to 40 Napier Court by 1939, the next registers are after the war and they don't appear in those for London as far as I can see.